Yes

you do need a jacket based on the weather in Georgetown, Halton Hills, ON, Canada 1 second ago

Why? Because it's not very warm out!
50°F10°C & Clear

Wind is 6 mph10 km/h from the West, gusting to 14 mph22 km/h
August 27
5am50°F10°C7 mph11 km/h WestClear
6am49°F10°C7 mph11 km/h WestClear
7am50°F10°C7 mph11 km/h WestClear
8am53°F12°C6 mph10 km/h WestClear
9am57°F14°C8 mph12 km/h WestMostly Clear
10am61°F16°C8 mph13 km/h NorthwestMostly Clear
11am64°F18°C8 mph13 km/h NorthwestMostly Clear
12pm66°F19°C8 mph13 km/h NorthwestMostly Clear
1pm68°F20°C8 mph14 km/h NorthwestMostly Clear
2pm69°F21°C8 mph14 km/h NorthwestPartly Cloudy
3pm70°F21°C9 mph15 km/h WestPartly Cloudy
4pm69°F21°C10 mph16 km/h WestMostly Cloudy
DateLowHighWindDayNight
August 2749°F10°C70°F21°C9 mph14 km/h from WestPartly CloudyMostly Cloudy
August 2853°F12°C65°F18°C10 mph16 km/h from WestRainDrizzle
August 2949°F9°C64°F18°C9 mph14 km/h from NorthwestMostly CloudyMostly Clear
August 3049°F9°C68°F20°C8 mph14 km/h from NorthwestPartly CloudyClear
August 3150°F10°C73°F23°C4 mph7 km/h from NorthMostly ClearMostly Clear
September 153°F12°C74°F23°C4 mph7 km/h from EastMostly ClearClear
September 256°F13°C74°F23°C6 mph9 km/h from SoutheastPartly CloudyMostly Clear

Yes

Low of 54°F12°C, High of 65°F19°C
Wind: 10 mph16 km/h
Precipitation: 59% rain

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